Solar Physics

, Volume 277, Issue 2, pp 389–395 | Cite as

A Simple Method to Check the Reliability of Annual Sunspot Number in the Historical Period 1610 – 1847

Article

Abstract

A simple method to detect inconsistencies in low annual sunspot numbers based on the relationship between these values and the annual number of active days is described. The analysis allowed for the detection of problems in the annual sunspot number series clustered in a few explicit periods, namely: i) before Maunder minimum, ii) the year 1652 during the Maunder minimum, iii) the year 1741 in Solar Cycle −1, and iv) the so-called “lost” solar cycle in the 1790s and the subsequent onset of the Dalton Minimum.

Keywords

Sunspot number Solar activity in the past 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • J. M. Vaquero
    • 1
    • 2
  • R. M. Trigo
    • 2
    • 3
  • M. C. Gallego
    • 1
  1. 1.Departamento de FísicaUniversidad de ExtremaduraBadajozSpain
  2. 2.CGUL-IDLUniversidade de LisboaLisbonPortugal
  3. 3.Departamento de Eng. CivilUniversidade LusófonaLisbonPortugal

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